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The Wonder Weeks

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The Wonder Weeks: A Stress-Free Guide to Your Baby's Behavior
AuthorFrans X. Plooij
Hetty van de Rijt
SubjectInfant development
Publication date
1992/2003
ISBN978-1-68268-427-6

The Wonder Weeks: A Stress-Free Guide to Your Baby's Behavior is a book with advice to parents about child development by physical anthropologist Hetty van de Rijt and ethologist and developmental psychologist Frans Plooij. Xaviera Plas-Plooij is a third author of recent editions. It was first published in English in 2003[1] as the translation of the 1992 Dutch book Oei, ik groei![2] The book claims that the cognitive development of babies occurs in predictably timed stages.[3] This has long been a controversy in developmental psychology.[4] Experts in child development have objected that sleep regressions are not so predictable.[5] A chapter on sleep was added to the 6th edition in 2019.[6][3] The publisher has produced a mobile app based on the book.[7]

Claims

The book describes 10 predictable 'leaps' observed in a child's cognitive development during the first 20 months, with 8 in the first year. Months are counted from the due date because development begins with conception.[8] These developmental 'leaps' consist of two phases, a phase where the baby is generally unhappy, followed by a period where the baby is generally happy, due to discovering new things with the newly gained cognitive skills. They are predicted to occur at 5, 8, 12, 17, 26, 36, 44, 53, 61-62 and 72-73 weeks old.[9]

Scientific Basis

Ethologists have documented predictable regression periods in the interactions of mothers and infants in many species, suggesting an early origin in evolution.[10][11][12] In the course of a longitudinal (1971-1973) ethological study of chimpanzees in the wild, working with Jane Goodall,[13] van de Rijt and Plooij published additional data demonstrating predictable regression periods in Chimpanzee mother-infant dyads, their correlation to illness, and the importance of the mother's interactions for learning and for growing independence.[14] [15][16][17][18] They hypothesized a new type of learning important in the evolution of human parenting, with reference to an explanation in control theory.[19] They then applied the observational methods of ethology to humans. Their first human study, involving 15 Dutch mothers and their infants, with extrinsic sources of stress carefully controlled, was published in the Journal of Reproductive and Infant Psychology in 1992.[20][21]

These behavioral observations have been correlated with stages of neurological development of the brain,[22] and research into development of the central nervous system has shown that the periods of rapid change (PRC) begin at the same times as the observed regression periods.[23] Consistent with increased stress, there is an uptick of illness during a regression period,[24] and a correlation with SIDS.[25] Parents' informal observations that babies master a cluster of new skills after each regression period has been verified.[26]

Controversy

With state funding for an independent replication study, Plooij obtained a temporary research position at the University of Groningen, where he had earned his degrees, and engaged a PhD student, Carolina de Weerth. She tested both behavior and cortisol levels in four infants, and failed to find any evidence of greater fussiness or higher cortisol levels corresponding to the leaps.[27][28] She later suggested that this might be due to inadequate sample size.[5] Plooij and other researchers objected that this was not a replication because the relevant data were obscured by extrinsic sources of stress which she failed to control.[29][30] Plooij and van de Rijt-Plooij reanalyzed de Werth's data and demonstrated that the phenomenon can be seen when the effects of identified extrinsic sources of stress are factored out.[31] According de Weerth and her thesis advisor, Paul van Geert, Frans Plooij tried to pressure her into not publishing the study.[28][32][5] Plooij disputes this account.[5] De Werth's dissertation was published with van Geert as co-author.[33] Plooij resigned his research affiliation with his alma mater[28][34][35] and has continued his research under other auspices.[36] The Plooijs' 1992 study has subsequently been independently replicated at universities in three countries, Oxford in England,[37] Girona in Spain,[38][39] and Gothenburg in Sweden.[40]

References

  1. ^ Vanderijt, Hetty; Plooij, Frans X. (2003). The wonder weeks: how to turn your baby's 8 great fussy phases into magical leaps forward. Emmaus, Pa: Rodale. ISBN 978-1-57954-645-8.
  2. ^ Van De Rijt, Hetty; Plooij, Frans X. (1992). Oei, ik groei! [Ai, I'm growing!] (in Dutch). Ede and Antwerp: Zomer & Keuning Boeken BV.
  3. ^ a b Verhoeven, Eymeke (2018-03-07). "Je kind loopt nog niet? Maakt niet uit" [Your child isn't walking yet? It doesn't matter]. Nederlands Dagblad (in Dutch). Retrieved 2024-02-25.
  4. ^ Kalverboer, L. (1998). "Ontwikkelingssprongen in het duister: Over transities in de ontwikkeling" [Developmental leaps in the dark: On transitions in development]. Neuropraxis. 1. doi:10.1007/BF03070912. Verloopt het vroegkinderlijke ontwikkelingsproces geleidelijk of sprongsgewijs? Deze vraag houdt onderzoekers bezig sinds het begin van deze eeuw, toen de systematische studie van de ontwikkeling van het kind begon. [Is the early childhood development process gradual or in leaps? This question has preoccupied researchers since the beginning of this century, when the systematic study of child development began.]
  5. ^ a b c d Wapner, Jessica (2020-04-16). "Are Sleep Regressions Real?". The New York Times. ISSN 0362-4331. Archived from the original on 2023-06-05. Retrieved 2023-12-17.
  6. ^ Rijt, Hetty van de; Plooij, Frans X.; Plas-Plooij, Xaveira (September 2019). The Wonder Weeks: A Stress-Free Guide to Your Baby's Behavior. New York: W. W. Norton. p. 464. ISBN 978-1-68268-427-6.
  7. ^ "The Wonder Weeks App". The Wonder Weeks. Retrieved 2017-08-27.
  8. ^ The Wonder Weeks (2019 ed.) p. 23.
  9. ^ Ibid. p. 22.
  10. ^ Horwich, Robert H. (1974). ""Regressive Periods in Primate Behavioral Development with Reference to Other Mammals"". Primates. 15 (2–3): 141–149. doi:10.1007/BF01742277. S2CID 6922407. Retrieved 2024-02-26.
  11. ^ Hinde, R.A., ed. (1983). Primate Social Relationships: An Integrated Approach. Oxford: Blackwell Scientific.
  12. ^ "Before our research, such regression phases had been found by others in 12 other primate species and two lower mammalian species, indicating that this appears to be an old phenomenon, perhaps emerging during the very evolution of life on earth" ("Introduction" (by F.X. Plooij), ibid. p. 15).
  13. ^ Rojas-Rocha, Xochitl (2014-08-22). "Gombe chimpanzee calls available after 40-year wait". Science News. No. 22579. American Association for the Advancement of Science. Retrieved 2024-02-25.
  14. ^ Plooij, F.X. (1984). Lipsitt, L.P. (ed.). "The Behavioral Development of Free-living Chimpanzee Babies and Infants". Monographs on Infancy. 3. New York: Ablex Publishing: 1–207.
  15. ^ van de Rijt-Plooij, H.H.C.; Plooij, F. X. (1986). "The involvement of interactional processes and hierarchical systems control in the growing independence in chimpanzee infancy". In Wind, J. (ed.). Essays in human sociobiology, vol. 2. Brussels: VUB Press. pp. 155–165.
  16. ^ van de Rijt-Plooij, H.H.C.; Plooij, F. X. (1987). "Growing independence, conflict and learning in mother-infant relations in free-ranging chimpanzees". Behaviour. 101 (1–3): 1–86. doi:10.1163/156853987X00378.
  17. ^ van de Rijt-Plooij, H.H.C.; Plooij, F. X. (1988). "Mother-infant relations, conflict, stress and illness among free-ranging chimpanzees". Developmental Medicine & Child Neurology. 30 (3): 306–15. PMID 3402672.
  18. ^ Van de Rijt-Plooij, H.H.C.; Plooij, F. X. (1988). "Nonverbale interakties in de moeder-kind relatie bij vrijlevende chimpansees; Afstotingsprocessen: Conflict en leren, escalatie en ziekte" [Non-verbal interactions in the mother-infant relationship in free-living chimpanzees; Rejection processes: Conflict and learning, escalation and illness]. Nederlands Tijdschrift voor de Psychologie. 43: 105–114.
  19. ^ Plooij, F. X.; van de Rijt-Plooij, H.H.C. (1989). "Evolution of human parenting: Canalization, new types of learning, and mother-infant conflict". European Journal of Psychology of Education. 4: 177–192. doi:10.1007/BF03172599.
  20. ^ Van De Rijt-Plooij, Hedwig H.C.; Plooij, Frans X. (July 1992). "Infantile regressions: Disorganization and the onset of transition periods". Journal of Reproductive and Infant Psychology. 10 (3): 129–149. doi:10.1080/02646839208403946. ISSN 0264-6838.
  21. ^ In the same year the first version of this book for the general public was published in the Dutch language. Van De Rijt, Hetty; Plooij, Frans X. (1992). Oei, ik groei! [Ai, I'm growing!] (in Dutch). Ede and Antwerp: Zomer & Keuning Boeken BV.
  22. ^ Plooij, F. X.; Rijt-Plooij, H. H. C. van de (1990). "Developmental transitions as successive reorganizations of a control hierarchy". American Behavioral Scientist. 34 (1): 67–80. doi:10.1177/0002764290034001007. S2CID 144183592.
  23. ^ Trevarthen, C.; Aitken, K. (2003). "Regulation of Brain Development and Age-Related Changes in Infants' Motives: The Developmental Function of Regressive Periods". In Heimann, Mikael (ed.). Regression periods in human infancy. Mahwah, NJ: Erlbaum. pp. 107–184. ISBN 0-8058-4098-2.
  24. ^ Plooij, Frans X.; Rijt-Plooij, Hedwig H.C. van de; Stelt, Jeannette M. van der; Es, Bert van; Helmers, Roelof (2003). "Chapter 6: Illness Peaks During Infancy and Regression Periods". In Heimann, Mikael (ed.). Regression Periods in Human Infancy. Lawrence Erlbaum Associates. pp. 81–96.
  25. ^ Plooij, Frans X.; Rijt-Plooij, Hedwig H.C. van de; Helmers, Roelof (2003). "Chapter 7: Multimodal Distribution of SIDS and Regression Periods". In Heimann, Mikael (ed.). Regression Periods in Human Infancy. Lawrence Erlbaum Associates. pp. 97–106.
  26. ^ Sadurni, M.; Burriel, M. P.; Plooij, F. X. (2010). "The temporal relation between regression and transition periods in early infancy". The Spanish Journal of Psychology. 13 (1): 112–126.
  27. ^ de Weerth, C.; van Geert, P. (1998-03-01). "Emotional instability as an indicator of strictly timed infantile developmental transitions". British Journal of Developmental Psychology. 16 (1): 15–44. doi:10.1111/j.2044-835X.1998.tb00748.x. ISSN 2044-835X.
  28. ^ a b c Kok, Annemarie (1997-11-19). "'Oei, ik groei!' leidt tot bittere ruzie van wetenschappers". Trouw. Retrieved 14 June 2015.
  29. ^ Woomore, Aslhley; Richer, John (2003). "Chapter 3: Detecting Infant Regression Periods: Weak Signals in a Noisy Environment". In Heimann, Mikael (ed.). Regression periods in human infancy. Mahwah, NJ: Erlbaum. pp. 23–40. ISBN 0-8058-4098-2.
  30. ^ Plooij, F. X.; van de Rijt-Plooij, H.H.C. (2003). "Chapter 5: The Effects of Sources of "Noise" on Direct Observation Measures of Regression Periods: Case Studies of Four Infants' Adaptations to Parental Conditions". In Heimann, Mikael (ed.). Regression periods in human infancy. Mahwah, NJ: Erlbaum. pp. 57–80. ISBN 0-8058-4098-2.
  31. ^ Ibid.
  32. ^ "'Oei, ik groei!' leidt tot bittere ruzie van wetenschappers". Trouw (in Dutch). Archived from the original on 2017-08-27. Retrieved 2017-08-27. zeer onfatsoenlijk
  33. ^ Weerth, C. d., & Geert, P. v. (1998). Emotional instability as an indicator of strictly timed infantile developmental transitions. British Journal of Developmental Psychology, 16, 15-44
  34. ^ Dirks, Bart (January 13, 1997). "Hoogleraar woedend over weerlegging theorie". Algemeen Dagblad (AD). Retrieved 14 June 2015.
  35. ^ Dirks, Bart (1998-01-14). "Positie Plooij onhoudbaar na openlijke kritiek op oud-promovenda; Auteur 'Oei, ik groei' ontslagen als hoogleraar". Volkskrant. Retrieved 14 June 2015.
  36. ^ Plooij, F. X. (2010). "The 4 WHY's of Age-Linked Regression Periods in Infancy". In Lester, B. M.; Sparrow, J. D. (eds.). Nurturing Children and Families: Building on the Legacy of T. Berry Brazelton. Malden, MA: Wiley-Blackwell. pp. 107–119.
  37. ^ Woolmore, A.; Richer, J. (2003). "Detecting infant regression periods: weak signals in a noisy environment". In Heimann, M. (ed.). Regression periods in human infancy. Mahwah, NJ: Erlbaum. pp. 23–39. ISBN 978-0-8058-4098-8.
  38. ^ Sadurní, M.; Rostan, C. (2002). "Regression periods in infancy: A case study from Catalonia". Spanish Journal of Psychology. 5 (1): 36–44. doi:10.1017/s1138741600005813. hdl:10256/1720. PMID 12025364.
  39. ^ Sadurní, M.; Rostan, C. (2003). "Reflections on regression periods in the development of Catalan infants". In Heimann, Mikael (ed.). Regression periods in human infancy. Mahwah, NJ: Erlbaum. pp. 7–22. ISBN 0-8058-4098-2.
  40. ^ Lindahl, L.; Heimann, M.; Ullstadius, E. (2003). "Occurrence of regressive periods in the normal development of Swedish infants". In Heimann, M. (ed.). Regression periods in human infancy. Mahwah, NJ: Erlbaum. pp. 41–55. ISBN 978-0805840988.
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